Precipitation and Dissolution Phenomena in Al-Zn Alloys

Popović, Stanko and Gržeta, Biserka (1999) Precipitation and Dissolution Phenomena in Al-Zn Alloys. Croatica Chemica Acta, 72 (2-3). pp. 621-642. ISSN 0011-1643

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Abstract

The microstructure of Al-Zn alloys, with the Zn atom fraction, xZn 62%, has been studied in detail by XRD in dependence on the composition,temperature and previous thermal treatment. Precipitationphenomena in alloys, transferred to the supersaturated stateby rapid quenching from the solid solution temperature, Tss, in waterat RT, have been followed in dependence on the ageing time atRT or elevated temperature. The equilibrium state, reached by ageing,has been compared with that obtained by slow cooling from Tssto RT. Phase transitions, dissolution and precipitation processes inthe alloys, transferred to the equilibrium state, have been studiedin situ in dependence on temperature from RT to Tss. A temperaturehysteresis in reversal phase transitions has been observed oncooling from Tss to RT. Repeated heating and cooling cycles haverevealed different microstructure in alloys having undergone differentthermal treatments between RT and Tss. A change in thephase diagram of the Al-Zn system is necessary in the compositionregion xZn > 50%.

Item Type: Article
Keywords: Al-Zn alloys, solid solutions, precipitation phenomena in solids, phase transitions, phase diagram, X-ray powder diffraction
Date: 1999
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Publisher: Hrvatsko kemijsko društvo
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 25 Apr 2014 08:27
Last Modified: 25 Apr 2014 11:08
URI: http://digre.pmf.unizg.hr/id/eprint/966

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